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700/800 Mhz Trunked Radio & Communications System Coverage

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CITY OF HOUSTON RFP S29- T22459 EARLY RELEASE COVERAGE REQUIREMENTS, 4/23/07 Section 700/800 MHz Trunked Radio & Communications 1 System Coverage Performance 1.1 Overview of Required Coverage Reliable two-way radio coverage is the foundation of any Public Safety and Local Government radio communications system. The City of Houston has outgrown its current Police, Fire / EMS, and Public Works & Engineering radio systems and is in the process of replacing these systems. The new radio system developed through this project will represent a new start, a new system, and a new era in wireless communications for the City of Houston. The purpose of this section in the RFP is to clearly articulate the City’s preliminary radio coverage requirements for the new system so that proposers can develop their system offerings with a clear understanding of the City’s expectations and requirements. There are many aspects of radio coverage performance that will be addressed in this Section of the RFP so that proposers can have relevant, factual information upon which to develop their system designs. It is important to note that the information that follows is preliminary and is subject to change prior to release of the finalized system RFP. The City will not be responsible for any costs involved in the vendors’ proposal development. The enclosed information is being released early, prior to the release of the full system RFP in an effort to provide qualified responders preliminary information so that they can begin the process of developing their system strategies. Hopefully, this early information will help reduce the time needed for the preparation of system proposals after the final RFP document is released by the City. Some of the topics contained in this early release include: ¾ A description of the City’s required coverage areas ¾ The type of coverage required i.e. mobile, portable on street, portable in light structures, portable in medium / heavy structures, and coverage in special areas such as the City’s downtown tunnel system and selected buildings ¾ Use of portable radios (head level / belt level, speaker mics, radio carrying devices such as swivel attachments for belt use) ¾ Delivered audio quality performance (TIA / TSB-88 DAQ – voice sound quality required for the system) ¾ Coverage reliability throughout the defined coverage areas ¾ A brief overview of coverage acceptance testing requirements that will be used to verify coverage performance once the system has been constructed Each of these issues is addressed in detail in the following pages of this Section. 700/800 MHZ TRUNKED RADIO & COMMUNICATION SYSTEM PAGE 1 CITY OF HOUSTON RFP S29- T22459 EARLY RELEASE COVERAGE REQUIREMENTS, 4/23/07 The City of Houston understands that one of the more challenging aspects of system development involves site selection and the number of sites needed for use in developing a system configuration. Any new system implemented by the City must comply with FCC regulatory requirements, including spectral efficiency. It is important that the system proposed for this project be capable of meeting radio coverage and spectral efficiency requirements without having to add a significant number of additional repeater sites after the initial purchase. To assist vendors in system development, several helpful pieces of information will be included in this Section of the RFP. This information includes the following: ¾ A listing of existing City radio tower locations ¾ A listing of City water towers ¾ A listing of City properties that may potentially support the development of new additional tower sites needed to meet coverage requirements ¾ A detailed listing of required buildings in which coverage is mandatory including a supplemental map of the Houston area with the buildings plotted on the map. ¾ A map of the Downtown underground tunnel system which must be covered 1.1.1 Coverage Definition Coverage is defined as the ability to successfully complete inbound (field to dispatch) outbound, (dispatch to field), and radio to radio voice communications in a repeat mode via the system infrastructure throughout the designated areas, standing still, and while in motion, with at least the minimum required level of audio quality (per TIA / TSB-88B or latest approved version DAQ) and with at least the specified level of propagation reliability stated in this Section. This level of performance is required for analog (if proposed), digital, and digitally encrypted modes of operation. Audio Quality For informational purposes, proposers will be required to submit with their proposals their recorded samples of analog and digital voice messages for the following DAQ levels: ♦ DAQ 2.0 ♦ DAQ 3.0 ♦ DAQ 3.4 ♦ DAQ 4.0 ♦ DAQ 5.0 Audio samples may be submitted in the .WAV file format on CD-R media and will be reviewed by the City’s evaluation team. For reference, the DAQ definitions, as defined in Bulletin TSB-88 are listed below: Table 1 – Delivered Audio Quality Scale Definitions 700/800 MHZ TRUNKED RADIO & COMMUNICATION SYSTEM PAGE 2 CITY OF HOUSTON RFP S29- T22459 EARLY RELEASE COVERAGE REQUIREMENTS, 4/23/07 Delivered Audio Quality Subjective Performance Description DAQ 5.0 Speech easily understood. DAQ 4.5 Speech easily understood. Infrequent Noise/Distortion. DAQ 4.0 Speech easily understood. Occasional Noise/Distortion. DAQ 3.4 Speech understandable with repetition only rarely required. Some Noise/Distortion. DAQ 3.0 Speech understandable with slight effort. Occasional repetition required due to Noise/Distortion. DAQ 2.0 Understandable with considerable effort. Frequent repetition due to Noise/Distortion. DAQ 1.0 Unusable, speech present but unreadable. Coverage Reliability All references to coverage reliability in this document refer to area reliability. For example, the phrase "95% coverage" indicates that 95% of the bounded areas described shall exhibit the specified coverage resulting in a DAQ 3.4 at least 95% of the time. It will not be acceptable to provide a design where two or more adjacent failed grids exist, that is, failed points shall not be unique to any one vicinity, while still meeting the overall coverage reliability goals. 1.1.2 Mobile Radio Coverage Mobile radio coverage will likely be limited by the Region 51 700 MHz plan guidelines which are undergoing finalization at this time. Mobile coverage performance will be expected to exceed and extend beyond the range of portable radios. Additional information regarding mobile coverage will be provided in the final system RFP. The Houston Police Department currently utilizes low silhouette “blade type” radio antennas mounted on the trunk lid of its police vehicles. HPD wants to continue this practice; therefore the antennas for the HPD units shall be of this type. Portable Radio Coverage On-Street Portable radio coverage on-street shall be provided with the portable radio and antenna worn on the waist (3’ AGL) throughout the designated areas in Figure 1 that follows. For day-to-day operation, some user agencies may use speaker/microphones with antennas, however for system design, radio coverage prediction, proposal development and system acceptance testing, speaker/ microphones with antennas on the mic shall not be used. The radio will be positioned at belt level with the antenna. Unusually large portable radio antennas may present operational problems for some user personnel. Proposers must clearly identify the specific antenna proposed for this project and must provide sample radios with the proposed antenna at their oral presentation after submission of a system proposal. Other portable radio antennas that are not proposed shall not be shown at the oral presentations. 700/800 MHZ TRUNKED RADIO & COMMUNICATION SYSTEM PAGE 3 CITY OF HOUSTON RFP S29- T22459 EARLY RELEASE COVERAGE REQUIREMENTS, 4/23/07 Some vendors state that their portable radio carrying devices impact coverage performance. To eliminate ambiguity in this area, the City is requiring that the system design be based on a “belt clip” carrying device. If the carrying devices for your portable radio (leather case with swivel attachment, etc.) have an impact on coverage performance, such impact shall be clearly described in the section of your proposal that includes your proposed coverage maps. It is important that the system design be based on real-world operational characteristics and a “worst case” carrying device which will be defined as the belt clip device. 700/800 MHZ TRUNKED RADIO & COMMUNICATION SYSTEM PAGE 4 CITY OF HOUSTON RFP S29- T22459 EARLY RELEASE COVERAGE REQUIREMENTS, 4/23/07 Figure 1 – Required Coverage Areas for Portable Radios (Excludes 30 dB) 700/800 MHZ TRUNKED RADIO & COMMUNICATION SYSTEM PAGE 5 CITY OF HOUSTON RFP S29- T22459 EARLY RELEASE COVERAGE REQUIREMENTS, 4/23/07 In-Building Coverage – 10 dB Structures (Typically residential structures) Coverage is required for portable radios worn on the belt within residential or other structures, defined as buildings with 10 dB or less penetration loss, within the area depicted in Figure No. 1 on the previous page. In-Building Coverage – 20 dB Structures (Typically medium to heavy structures) A system infrastructure baseline of 20 dB in-building coverage is required for portable radios worn on the belt while operating within structures having up to 20 dB of penetration loss within the areas depicted in Figure No. 1 on the previous page. Downtown Area In-Building Coverage – 30 dB Structures (Typically heavy structures) A system infrastructure baseline of 30 dB in-building coverage
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